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<h1 class="title">LibPNG, version 1.6&#x2e;37</h1>
<span class="subtitle"></span>
<!-- $$$qtgui-attribution-libpng.html-description -->
<div class="descr"> <a name="details"></a>
<a name="libpng"></a><p>libpng is the official PNG reference library.</p>
<p>Used in the qpng image plugin. Configure with -system-libpng or -no-libpng to avoid.</p>
<p>The sources can be found in tqtc-qt5/qtbase/src/3rdparty/libpng.</p>
<p><a href="http://www.libpng.org/pub/png/libpng.html">Project Homepage</a>, upstream version: 1.6&#x2e;37</p>
<pre class="cpp plain">

  Copyright (c) 1998-2018 Glenn Randers-Pehrson
  Copyright (c) 2000-2017 Simon-Pierre Cadieux
  Copyright (c) 2000-2017 Eric S. Raymond
  Copyright (c) 2000-2017 Mans Rullgard
  Copyright (c) 2000-2019 Cosmin Truta
  Copyright (c) 2000-2017 Gilles Vollant
  Copyright (c) 2000-2017 James Yu
  Copyright (c) 2000-2017 Mandar Sahastrabuddhe
  Copyright (c) 1998-2000 Tom Lane
  Copyright (c) 1998-2000 Willem van Schaik
  Copyright (c) 1996-1997 Andreas Dilger
  Copyright (c) 1996-1997 John Bowler
  Copyright (c) 1996-1997 Kevin Bracey
  Copyright (c) 1996-1997 Sam Bushell
  Copyright (c) 1996-1997 Magnus Holmgren
  Copyright (c) 1996-1997 Greg Roelofs
  Copyright (c) 1996-1997 Tom Tanner
  Copyright (c) 1995-1996 Dave Martindale
  Copyright (c) 1995-1996 Paul Schmidt
  Copyright (c) 1995-1996 Tim Wegner
  Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.

</pre>
<p>libpng License and libpng License 2.</p>
<pre class="cpp plain">

  COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
  =========================================

  PNG Reference Library License version 2
  ---------------------------------------

   * Copyright (c) 1995-2019 The PNG Reference Library Authors.
   * Copyright (c) 2018-2019 Cosmin Truta.
   * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
   * Copyright (c) 1996-1997 Andreas Dilger.
   * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.

  The software is supplied &quot;as is&quot;, without warranty of any kind,
  express or implied, including, without limitation, the warranties
  of merchantability, fitness for a particular purpose, title, and
  non-infringement.  In no event shall the Copyright owners, or
  anyone distributing the software, be liable for any damages or
  other liability, whether in contract, tort or otherwise, arising
  from, out of, or in connection with the software, or the use or
  other dealings in the software, even if advised of the possibility
  of such damage.

  Permission is hereby granted to use, copy, modify, and distribute
  this software, or portions hereof, for any purpose, without fee,
  subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you
      must not claim that you wrote the original software.  If you
      use this software in a product, an acknowledgment in the product
      documentation would be appreciated, but is not required.

   2. Altered source versions must be plainly marked as such, and must
      not be misrepresented as being the original software.

   3. This Copyright notice may not be removed or altered from any
      source or altered source distribution.


  PNG Reference Library License version 1 (for libpng 0.5 through 1.6&#x2e;35)
  -----------------------------------------------------------------------

  libpng versions 1.0&#x2e;7, July 1, 2000, through 1.6&#x2e;35, July 15, 2018 are
  Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are
  derived from libpng-1.0&#x2e;6, and are distributed according to the same
  disclaimer and license as libpng-1.0&#x2e;6 with the following individuals
  added to the list of Contributing Authors:

      Simon-Pierre Cadieux
      Eric S. Raymond
      Mans Rullgard
      Cosmin Truta
      Gilles Vollant
      James Yu
      Mandar Sahastrabuddhe
      Google Inc.
      Vadim Barkov

  and with the following additions to the disclaimer:

      There is no warranty against interference with your enjoyment of
      the library or against infringement.  There is no warranty that our
      efforts or the library will fulfill any of your particular purposes
      or needs.  This library is provided with all faults, and the entire
      risk of satisfactory quality, performance, accuracy, and effort is
      with the user.

  Some files in the &quot;contrib&quot; directory and some configure-generated
  files that are distributed with libpng have other copyright owners, and
  are released under other open source licenses.

  libpng versions 0.97, January 1998, through 1.0&#x2e;6, March 20, 2000, are
  Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
  libpng-0.96, and are distributed according to the same disclaimer and
  license as libpng-0.96, with the following individuals added to the
  list of Contributing Authors:

      Tom Lane
      Glenn Randers-Pehrson
      Willem van Schaik

  libpng versions 0.89, June 1996, through 0.96, May 1997, are
  Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
  and are distributed according to the same disclaimer and license as
  libpng-0.88, with the following individuals added to the list of
  Contributing Authors:

      John Bowler
      Kevin Bracey
      Sam Bushell
      Magnus Holmgren
      Greg Roelofs
      Tom Tanner

  Some files in the &quot;scripts&quot; directory have other copyright owners,
  but are released under this license.

  libpng versions 0.5, May 1995, through 0.88, January 1996, are
  Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.

  For the purposes of this copyright and license, &quot;Contributing Authors&quot;
  is defined as the following set of individuals:

      Andreas Dilger
      Dave Martindale
      Guy Eric Schalnat
      Paul Schmidt
      Tim Wegner

  The PNG Reference Library is supplied &quot;AS IS&quot;.  The Contributing
  Authors and Group 42, Inc. disclaim all warranties, expressed or
  implied, including, without limitation, the warranties of
  merchantability and of fitness for any purpose.  The Contributing
  Authors and Group 42, Inc. assume no liability for direct, indirect,
  incidental, special, exemplary, or consequential damages, which may
  result from the use of the PNG Reference Library, even if advised of
  the possibility of such damage.

  Permission is hereby granted to use, copy, modify, and distribute this
  source code, or portions hereof, for any purpose, without fee, subject
  to the following restrictions:

   1. The origin of this source code must not be misrepresented.

   2. Altered versions must be plainly marked as such and must not
      be misrepresented as being the original source.

   3. This Copyright notice may not be removed or altered from any
      source or altered source distribution.

  The Contributing Authors and Group 42, Inc. specifically permit,
  without fee, and encourage the use of this source code as a component
  to supporting the PNG file format in commercial products.  If you use
  this source code in a product, acknowledgment is not required but would
  be appreciated.

</pre>
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